H - Electricity – 04 – N
Patent
H - Electricity
04
N
365/34, 350/94
H04N 5/44 (2006.01) H03J 7/04 (2006.01) H04N 5/46 (2006.01)
Patent
CA 1313255
ABSTRACT OF THE DISCLOSURE A tuner for use in two systems utilizes a determining circuit. To determine whether or not a baseband signal, after demodulation includes a sound carrier. If a sound carrier is present, the determining circuit determines that the received television signal is a television signal in the NTSC system, or if a sound carrier is not present, a television signal in the MUSE system. When the received television signal is a television signal in the NTSC system, switches are activated such that the baseband signal is applied to a signal processing circuit for video and a signal processing circuit for sound which are compatible with the NTSC system. An averaging AFC is selected by these switches. On the other hand, when the received television is a television signal in the MUSE system, switches are activated such that the baseband signal is applied to an MUSE decoder, and a keyed AFC is selected.
583304
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
LandOfFree
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